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Kyle SantosFlag for United States of America

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iPhone text Messages app is really slow and laggy now with iOS 11. How can I fix this?

I have an iPhone SE.  I was on iOS 10.3.3 for a while and was avoiding iOS11 because I'm not too keen on updating to the latest version until I stop hearing the multitude of reports of issues on the latest version.

However, Apple tricked me when I thought I was dismissing/delaying their update and they updated my iPhone overnight.  This was a few weeks ago this happened.  And its just been incredibly frustrating using Messages since that happened.  I've tried restarting my iPhone, deleting a ton of older messages, but the app's performance is just atrocious.

When I am typing a message it lags to produce the word into the message.  When I press send its laggy in sending the message.  When I try to attach pictures there is a delay too.  The scrolling is not terrible, but noticeable lag is there.  I don't see this type of issue on other apps I use on the iPhone, so I believe I've narrowed it down to Messages app.

What can I do to get back to the great app performance I had when on iOS 10.3.3?

My iPhone does regular backups to iCloud.
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John
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Thanks.  Seems drastic a solution for one app's performance being degraded while other apps are just fine for me.

Apple has said the batteries on iPhone 6 and above (including SE) need to be replaced. The battery is being throttled back to prevent shutdown but performance suffers.
That would be inline with this report.  http://appleinsider.com/articles/17/12/20/apple-responds-to-reports-of-worn-battery-forcing-iphone-cpu-slowdown

Someone shared this with me a few days ago and I finally got around to reading it.  http://bgr.com/2018/01/01/iphone-battery-replacement-29-how-to-iphone-slowdown-scandal/  
This conversation also provided help as well.
https://www.reddit.com/r/iphone/comments/7inu45/psa_iphone_slow_try_replacing_your_battery/

C'est la vie
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Cheers and good luck. I am going to get my own battery replaced soon
You can also try a Network Reset. Settings , General, Reset, an Reset Network devices
Forgot about that.  I'll try that out.  Thanks!
This is probably a temporary solution, but it worked.  Thanks, John!!!
You are very welcome and again, happy to help.